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TGA investigation of polyurethane plastic thermal properties under different atmospheric conditions

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume, issue and page numbers will be assigned later)
DOI: http://dx.doi.org/10.13044/j.sdewes.d6.0254 (registered soon)
Hrvoje Mikulcic1 , Qiming Jin2, Hrvoje Stančin1, Xuebin Wang2, Shuaishuai Li2, Houzhang Tan2, Neven Duić1
1 Faculty of Mechanical Engineering and Naval Architecture University of Zagreb, Zagreb, Croatia
2 Department of Thermal Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China

Abstract

Recycling and energy recovery of waste plastic are major categories of modern solid waste management systems. Since the lower heating values of plastics are around 30 MJ/kg, equivalent to traditional solid fuels, such as petroleum coke, coal and charcoal, waste plastics are considered as potential fossil fuels alternatives in various industrial sectors. Already nowadays, energy recovery of waste plastic is typically conducted by combustion in incinerators or cement kilns. However due to various types of waste plastics, their thermochemical behaviour has been rarely investigated. Even more, the thermochemical behaviour of waste plastics under oxy-combustion conditions has even rarely been studied. In this study non-isothermal thermogravimetric analyser (TGA) was used to study the thermochemical behaviour of polyurethane plastic waste under seven different atmospheric conditions. Polyurethane decomposition kinetic constants have been estimated by the simultaneous evaluations of seven weight loss curves measured for the heating rate of 20 K/min and a final temperature of 1073 K. The obtained results showed that the combustion of polyurethane is mainly composed of two stages, and the higher oxygen concentration slightly influenced the first stage but highly accelerates the second one, ascribing to a higher mean weight loss rate and an increasing activation energy. Replacing CO2 with N2 slightly influences the first stage while positively influences the second stage, expressing in lower peak temperatures in DTG curves and higher peak values in DSC curves.

Keywords: Plastic waste; Polyurethane; thermal properties; TGA; oxy-combustion.

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